Table 1 Synthesis of FL and BPAOL base oils using 2-alkylfurans and aldehydes of varying molecular sizes.

Reaction conditions: HAA reactions of 2-alkylfurans with aldehyde to FL were conducted using 0.05 g of Aquivion PW98, 10 mmol 2-alkylfuran, and 5 mmol aldehyde at 65°C for 6 hours. HDO of FL to the corresponding BPAOL over the Ir-ReO_x/SiO₂ catalyst was performed using 0.3 g of FL in 10 ml of cyclohexane solvent and 0.15 g of catalyst at 5 MPa H₂ and 170°C for 12 hours.

	Reagents		HAA reaction		HDO reaction
Entry	R₁	R₂	Products	Yield (%)	Products	Yield (%)
1	Methyl	n-Undecyl	C₂₂-FL1	80	C₂₂-BPAOL1	91
2	Ethyl	n-Undecyl	C₂₄-FL1	82	C₂₄-BPAOL1	85
3	n-Propyl	n-Undecyl	C₂₆-FL1	94	C₂₆-BPAOL1	87
4	n-Butyl	n-Undecyl	C₂₈-FL1	89	C₂₈-BPAOL1	84
5	n-Pentyl	n-Undecyl	C₃₀-FL1	90	C₃₀-BPAOL1	87
6	n-Hexyl	n-Undecyl	C₃₂-FL1	89	C₃₂-BPAOL1	82
7*	n-Heptyl	n-Undecyl	C₃₄-FL1	85	C₃₄-BPAOL1	83
8	n-Pentyl	Methyl	C₂₀-FL1	89	C₂₀-BPAOL1	87
9	n-Pentyl	n-Pentyl	C₂₄-FL2	93	C₂₄-BPAOL2	89
10	n-Pentyl	n-Heptyl	C₂₆-FL2	91	C₂₆-BPAOL2	91
11	n-Pentyl	n-Nonyl	C₂₈-FL2	87	C₂₈-BPAOL2	87
12^†	n-Pentyl	2-Ethylpentyl	C₂₆-FL3	85	C₂₆-BPAOL3	87
13^†	n-Hexyl	2-Ethylpentyl	C₂₈-FL3	86	C₂₈-BPAOL3	82
14^†	n-Heptyl	2-Ethylpentyl	C₃₀-FL2	88	C₃₀-BPAOL2	81

*Eight hours.

†Twelve hours.